Hammer



FIG. 1 is a side view of a hammer embodying my new design;

FIG. 2 is an end elevational view thereof;

FIG. 3 is an opposite end elevational view thereof;

FIG. 4 is a bottom plan view thereof; n 00 FIG. 5 is a top plan view thereof. 

The ornamental design for a hammer, substantially as shown and described. 